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Question
At the 32-cell stage of division, the embryo is known as a blastula that contains inner cell mass and outer cell mass. What do the inner and outer cell masses eventually become?
At the 32-cell stage of division, the embryo is known as a blastula that contains inner cell mass and outer cell mass. What do the inner and outer cell masses eventually become?
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Solution
The correct option is B Embryo and foetus / large part of placenta
At the 8-16 cell stage of division, the developing embryo is known as morula. This morula further undergoes division to form blastula. Inside the blastula, there are two types of cells- the outer trophoblast and the inner cell mass (ICM).
The trophoblast helps the blastocyst attach itself to the endometrium of the uterus. The trophoblast then gives rise to 2 types of cells- the outer syncytiotrophoblast and the inner cytotrophoblast. The syncytiotrophoblast is able to penetrate into the endometrium. Along with the endometrial tissues, it contributes to the formation of placenta.
Upon division, the ICM gives rise to two types of cells- the top layer of epiblast and the bottom layer of hypoblast. The hypoblast gives rise to the primary yolk sac.
Therefore, we see that the inner cell mass eventually becomes the embryo and the outer cell mass becomes a large part of the placenta.
The chorion is derived from trophoblastic ectoderm and extraembryonic mesoderm.
Allantois is an extra embryonic membrane which is small and mostly non-functional in humans except for furnishing blood vessels to the placenta.
At the 8-16 cell stage of division, the developing embryo is known as morula. This morula further undergoes division to form blastula. Inside the blastula, there are two types of cells- the outer trophoblast and the inner cell mass (ICM).
The trophoblast helps the blastocyst attach itself to the endometrium of the uterus. The trophoblast then gives rise to 2 types of cells- the outer syncytiotrophoblast and the inner cytotrophoblast. The syncytiotrophoblast is able to penetrate into the endometrium. Along with the endometrial tissues, it contributes to the formation of placenta.
Upon division, the ICM gives rise to two types of cells- the top layer of epiblast and the bottom layer of hypoblast. The hypoblast gives rise to the primary yolk sac.
Therefore, we see that the inner cell mass eventually becomes the embryo and the outer cell mass becomes a large part of the placenta.
The chorion is derived from trophoblastic ectoderm and extraembryonic mesoderm.
Allantois is an extra embryonic membrane which is small and mostly non-functional in humans except for furnishing blood vessels to the placenta.
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